Experimental determination of gas holdup and volumetric mass transfer coefficient in a jet bubbling reactor

doi:10.1016/j.cjche.2020.07.051

中国化学工程学报 ›› 2021, Vol. 34 ›› Issue (6): 61-67.DOI: 10.1016/j.cjche.2020.07.051

• Separation Science and Engineering • 上一篇下一篇

Experimental determination of gas holdup and volumetric mass transfer coefficient in a jet bubbling reactor

Mostafa Abbasian-arani, Mohammad Sadegh Hatamipour, Amir Rahimi

Chemical Engineering Department, University of Isfahan, Isfahan, Iran

收稿日期:2020-04-16 修回日期:2020-06-15 出版日期:2021-06-28 发布日期:2021-08-30
通讯作者: Mohammad Sadegh Hatamipour
基金资助:
We are thankful to Dr. M. Momeni Shahraki and Dr. M. Gholami for their precious assistance during the experimental works. Also, the authors appreciate the vice-chancellor of research and technology of the University of Isfahan for supporting this work under Grant No. 911401707.

Experimental determination of gas holdup and volumetric mass transfer coefficient in a jet bubbling reactor

Mostafa Abbasian-arani, Mohammad Sadegh Hatamipour, Amir Rahimi

Chemical Engineering Department, University of Isfahan, Isfahan, Iran

Received:2020-04-16 Revised:2020-06-15 Online:2021-06-28 Published:2021-08-30
Contact: Mohammad Sadegh Hatamipour
Supported by:
We are thankful to Dr. M. Momeni Shahraki and Dr. M. Gholami for their precious assistance during the experimental works. Also, the authors appreciate the vice-chancellor of research and technology of the University of Isfahan for supporting this work under Grant No. 911401707.

摘要/Abstract

摘要： The hydrodynamics and mass transfer characteristics of a lab-scale jet bubbling reactor (JBR) including the gas holdup, volumetric mass transfer coefficient and specific interfacial area were assessed experimentally investigating the influence of temperature, pH and superficial gas velocity. The reactor diameter and height were 11 and 30 cm, respectively. It was equipped with a single sparger, operating at atmospheric pressure, 20 and 40℃, and two pH values of 3 and 6. The height of the liquid was 23 cm, while the superficial gas velocity changed within 0.010-0.040 m·s^-1 range. Experiments were conducted with pure oxygen as the gas phase and saturated lime solution as the liquid phase. The liquid-side volumetric mass transfer coefficient was determined under unsteady-state oxygen absorption in a saturated lime solution. The gas holdup was calculated based on the liquid height change, while the specific interfacial area was obtained by a physical method based on the bubble size distribution (BSD) in different superficial gas velocities. The results indicated that at the same temperature but different pH, the gas holdup variation was negligible, while the liquid-side volumetric mass transfer coefficient at the pH value of 6 was higher than that at the pH＝3. At a constant pH but different temperatures, the gas holdup and the liquid-side volumetric mass transfer coefficients at 40℃ were higher than that of the same at 20℃. A reasonable and appropriate estimation of the liquid-side volumetric mass transfer coefficient (k_la) in a pilot-scale JBR was provided which can be applied to the design and scale-up of JBRs.

关键词: Jet bubbling reactor, Liquid-side volumetric mass transfer coefficient, Gas holdup, Specific interfacial area, Experimental analysis

Abstract: The hydrodynamics and mass transfer characteristics of a lab-scale jet bubbling reactor (JBR) including the gas holdup, volumetric mass transfer coefficient and specific interfacial area were assessed experimentally investigating the influence of temperature, pH and superficial gas velocity. The reactor diameter and height were 11 and 30 cm, respectively. It was equipped with a single sparger, operating at atmospheric pressure, 20 and 40℃, and two pH values of 3 and 6. The height of the liquid was 23 cm, while the superficial gas velocity changed within 0.010-0.040 m·s^-1 range. Experiments were conducted with pure oxygen as the gas phase and saturated lime solution as the liquid phase. The liquid-side volumetric mass transfer coefficient was determined under unsteady-state oxygen absorption in a saturated lime solution. The gas holdup was calculated based on the liquid height change, while the specific interfacial area was obtained by a physical method based on the bubble size distribution (BSD) in different superficial gas velocities. The results indicated that at the same temperature but different pH, the gas holdup variation was negligible, while the liquid-side volumetric mass transfer coefficient at the pH value of 6 was higher than that at the pH＝3. At a constant pH but different temperatures, the gas holdup and the liquid-side volumetric mass transfer coefficients at 40℃ were higher than that of the same at 20℃. A reasonable and appropriate estimation of the liquid-side volumetric mass transfer coefficient (k_la) in a pilot-scale JBR was provided which can be applied to the design and scale-up of JBRs.

Key words: Jet bubbling reactor, Liquid-side volumetric mass transfer coefficient, Gas holdup, Specific interfacial area, Experimental analysis

Mostafa Abbasian-arani, Mohammad Sadegh Hatamipour, Amir Rahimi. Experimental determination of gas holdup and volumetric mass transfer coefficient in a jet bubbling reactor[J]. 中国化学工程学报, 2021, 34(6): 61-67.

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Experimental determination of gas holdup and volumetric mass transfer coefficient in a jet bubbling reactor

Experimental determination of gas holdup and volumetric mass transfer coefficient in a jet bubbling reactor

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